A highly reactive hollow tubular g-C₃N₄ isotype heterojunction (SCN-CN) was designed to enhance visible light absorption and manipulate the directed transfer of electrons and holes. The results of UV–vis DRS, XPS valence band and DFT theoretical calculations indicated S doping increases the visible-light absorption capacity and changed the ba nd gap structure of g-C₃N₄ (CN), resulting in the transfer of electrons from the CN to the SCN and holes from the SCN to the CN under visible light. In addition, the tubular structure of the SCN-CN facilitated the transfer of electrons in the longitudinal direction, which reduced charge carrier recombination. Furthermore, the optical properties, electronic structure, and electron transfer of SCN-CN were also studied by experiments and theoretical calculations. The antibiotic tetracycline hydrochloride (TCH) and dye Rhodamine B (RHB) were subjected to evaluate the photocatalytic performance of SCN-CN. The scavenger tests and ESR data showed that the h⁺, ·O₂⁻ and ·OH worked together in the photocatalytic process. Moreover, the photocatalytic degradation pathway was analyzed by LC-MS. This study synthesized a hollow tubular CN isotype heterojunction with high visible-light photocatalytic performance and provided a theoretical basis for CN isotype heterojunction.

设计了高反应性的空心管状gC ₃ N ₄同型异质结（SCN-CN），以增强可见光吸收并操纵电子和空穴的定向转移。紫外可见DRS，XPS价带和DFT理论计算的结果表明，S掺杂提高了可见光吸收能力并改变了gC ₃ N _4的键隙结构（CN），导致电子在可见光下从CN转移到SCN，并从SCN转移空穴到CN。另外，SCN-CN的管状结构促进了电子在纵向方向上的转移，这减少了电荷载流子的复合。此外，还通过实验和理论计算研究了SCN-CN的光学性质，电子结构和电子转移。用抗生素四环素盐酸盐（TCH）和染料若丹明B（RHB）评估SCN-CN的光催化性能。清除剂试验和ESR的数据显示，在H ⁺，·O2 ₂ ^-和·OH在光催化过程中一起工作。此外，通过LC-MS分析了光催化降解途径。本研究合成了具有高可见光光催化性能的空心管状CN同型异质结，为CN同型异质结提供了理论基础。